Waterproof Nylon & Suede Upper Seam Sealed Waterproof Construction Removable 200B 3M&trade, Thinsulate&trade, & Foam Liner Moisture Wicking Lining Waterproof Gusset Tongue Rustproof Speed Lacing System Waterproof & Flexible Synthetic Rubber Shell Kamik&rsquo, s SNOWTREAD Synthetic Rubber Winter Outsole Height 12 Inch (30.5cm) / Weight 3.44 lbs (1560g) (per pair) 3M&trade, Thinsulate&trade, Insulation Developed by 3M, this innovative microfiber insulation provides a large surface area that traps body heat. & it delivers warmth nearly two times more effectively than down or other synthetic insulations when equal thicknesses are compared. Seam Sealed This technology makes boots practically impenetrable to snow & moisture without adding any extra weight to the footwear. By specially treating our leathers & nylons, then using waterproof tapes & sealants to cover every seam, it&rsquo, s like feet are wrapped in a cocoon. So they stay safe & dry.